Rad oehlmann



No. 626,558. Patented June 6, I899.

E. H. C. OEHLMANN.

GAS LIGHTING APPARATUS.

(No Model.)

A ironuz rs.

'TH: NORRIS warns co morofima WASHINGTON, n cy lhvirnn STATES PATENTUFFICE.

EMIL HEINRICH CONRAD OEHLMANN, OF BERLIN, GERMANY.

GAS-LIGHTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 626,558, dated June 6,1899.

Application filed March 10,1898- Serial No. 673,297. (N0 11106813 T0 allwhont it may concern:

Be it known that I, EMIL HEINRICH CoN- RAD OEHLMANN, a citizen of theEmpire of Germ any, residing at Berlin, in the Kingdom of Prussia andEmpire of Germany, have invented certain new and useful Improvements inGas-Lighting Apparatus, (for which I have made applications for patentsin Germany, filed December 31, 1897; in Austria, filed December 31,1897; in Hungary, filed January 2, 1898; in Belgium, filed January 8,1898; in France, filed January 4, 1898; in Denmark, filed December 31,1897; in Sweden, filed January 3, 1898; in Switzerland, filed January 1,1898; in Italy, filed January 4:, 1898; in Great Britain, filed January7, 1898, and in Norway, filed January 10, 1898,) of which the followingis a specification.

This invention relates to gas-lighting apparatus of that class in whichcompressed air is used for raising the illuminating power of the as.

The object of the invention is to provide an automatic gas shut-oftarranged below the burner, which shut-off is worked by com pressed airin such a way that at the formation of the flame the compressed airrushes with such force through the mixing-chamber and burner that thebacklash of the flame and the explosive noise which is often producedthereby are prevented. The compressed air also acts in the same way atthe extinguishment of the flame.

In the accompanying drawing a vertical section of the apparatus isshown.

The apparatus comprises a gas-burner 0, with an incandescent mantle 0,which is surrounded bya cage of round or prismatic strips of glassarranged close to one another or provided with intermediate spaces;further, a mixing-tube m, which has openings 19, that may be controlledby an annular register or slide in the well-known manner, theignitingtube 1', the compressed-air nozzle t, gas-nozzle Z, double valveg g, forming a shut-ofi, spring f, gaschamber a, compressed-air chamber19, gas-passage c, compressed-air passages q and o", elastic diaphragme, and regulating-screw or needle-valve h. The passage 7" can itselfevidently be provided with a regulating-screw or needle-valve. Thediaphragm is composed of material non-decomposable by air or gas and canfor that purpose be made of different layers.

The passage 0 is connected with the gassupply pipe, which is providedwith a small regulating or sh u t-oif cook. The compressed air passage(1 is by means of a pipe controlled by a suitable cock connected with anaircompression apparatus of desired form.

The pressure of the air is maintained higher than that of theilluminating-gas and is set to a certain pressure through the medium ofa regulating-valve.

The method of operation is as follows: The illuminatinggas passes in thewell-known manner through the passage 0 to the gaschamber a, around thevalve g, and arrives at the igniting-flame through the valve-controlledpassage in the ignitingtube i, which is ready to ignite the gas and airmixture as soon as the same issues from the lower part of the burner.For the purpose of placing the incandescent burner in proper workingcondition compressed air is let in, which then passes into themixing-tube m and tends to carry forward with it all gas deposits. Upona certain pressure of air, which compressed air passes through thepassage 1 into air-chamber b, the elastic diaphragm and the spring areraised in order to open the gas-valve g. outflowing gas is immediatelytaken up by the compressed air and conducted to the igniting-flame insuch a way that no explosive mixture remains in the mixing-chamber, andconsequently a backlash of the flame is prevented. The gas andcompressed air together rush through the mixing-chamber m, whereby moreair is caused to be admitted through the openings 19, and the mixtureissuing from the upper part of the burner is ignited by theigniting-flame. Toputoutthelight,thecompressed air is let off from thesupply-pipe or is so far reduced that the gas-pressure,in connectionwith the spring f, moves the diaphragm e downward and closes the valveg, but opens valve g, so that the igniting-flame again burns full, andthe incandescent burner is ready for the next lighting.

The diaphragm and spring must be strong enough in order to leave thevalve g open when under a certain pressure and to close the same as soonas this pressure is reduced. This is necessary in order that thecompressed The p air, which still, after closing of the valve g, passesthrough the nozzle t into the mixingchamber, will cause the remaininggas in the apparatus to be led out with a rush, and thus theexplosive-like noise and the backlash of the flame are prevented.

Having thus described my invention, what I claim is- The combinationwith a gas-chamber, of a mixing-tube and an ignition-tube incommunication with such gas-chamber, a valve controlling suchcommunication, a compressedair chamber comprising a pressure device,whereby the compressed air is made to operate said valve, and acompressed-air conduit 15 opening into said air-chamber and into saidmixing-tube, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

EMIL HEINRICH CONRAD OEHLMANN.

Witnesses:

- O. H. DAY,

HENRY HAsPEm

